/*************************************************************************************
 * Copyright (c) 2004 Actuate Corporation and others.
 * All rights reserved. This program and the accompanying materials 
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 * 
 * Contributors:
 *     Actuate Corporation - Initial implementation.
 ************************************************************************************/

package org.eclipse.birt.report.taglib;

import java.io.IOException;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Iterator;
import java.util.List;
import java.util.Locale;
import java.util.TimeZone;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.jsp.JspException;
import javax.servlet.jsp.JspTagException;
import javax.servlet.jsp.JspWriter;
import javax.servlet.jsp.PageContext;
import javax.servlet.jsp.tagext.BodyTagSupport;
import javax.servlet.jsp.tagext.TagSupport;

import org.eclipse.birt.report.IBirtConstants;
import org.eclipse.birt.report.engine.api.IScalarParameterDefn;
import org.eclipse.birt.report.resource.BirtResources;
import org.eclipse.birt.report.resource.ResourceConstants;
import org.eclipse.birt.report.service.BirtReportServiceFactory;
import org.eclipse.birt.report.service.ParameterDataTypeConverter;
import org.eclipse.birt.report.service.api.IViewerReportDesignHandle;
import org.eclipse.birt.report.service.api.InputOptions;
import org.eclipse.birt.report.service.api.ParameterDefinition;
import org.eclipse.birt.report.service.api.ParameterGroupDefinition;
import org.eclipse.birt.report.service.api.ParameterSelectionChoice;
import org.eclipse.birt.report.service.api.ReportServiceException;
import org.eclipse.birt.report.taglib.component.ParamDefField;
import org.eclipse.birt.report.taglib.component.ViewerField;
import org.eclipse.birt.report.taglib.util.BirtTagUtil;
import org.eclipse.birt.report.utility.BirtUtility;
import org.eclipse.birt.report.utility.DataUtil;
import org.eclipse.birt.report.utility.ParameterAccessor;

/**
 * This tag is used to generate html code for report parameter.
 * 
 */
public class ParamDefTag extends BodyTagSupport
{

	/**
	 * Serial Version UID
	 */
	private static final long serialVersionUID = -1255870121526790060L;

	/**
	 * Parameter Definiation
	 */
	private ParamDefField param;

	/**
	 * Associated parameterPage tag object
	 */
	private RequesterTag requesterTag;

	/**
	 * Viewer supported attributes
	 */
	private ViewerField viewer;

	/**
	 * Current report parameter definition
	 */
	private ParameterDefinition paramDef;

	/**
	 * Input Options information
	 */
	private InputOptions options;

	/**
	 * Current isLocale setting
	 */
	private boolean isLocale = false;

	/**
	 * Current locale setting
	 */
	private Locale locale;
	
	/**
	 * Current time zone setting.
	 */
	private TimeZone timeZone;

	/**
	 * Current parameter format pattern
	 */
	private String pattern;

	/**
	 * value string
	 */
	private String valueString;

	/**
	 * value string list
	 */
	private List valueStringList;

	/**
	 * display text string
	 */
	private String displayTextString;

	/**
	 * parameter group object name
	 */
	private String groupObjName;

	/**
	 * Whether imported js/style files
	 */
	private static final String IMPORT_FILES_ATTR = "IMPORT_FILES_FLAG"; //$NON-NLS-1$
	private static final String ATTR_ID = "ID_"; //$NON-NLS-1$
	private static final String ATTR_PARAM = "PARAM_"; //$NON-NLS-1$

	/**
	 * Initialize pageContext
	 * 
	 * @see javax.servlet.jsp.tagext.TagSupport#setPageContext(javax.servlet.jsp.PageContext)
	 */
	public void setPageContext( PageContext context )
	{
		super.setPageContext( context );
		param = new ParamDefField( );
	}

	/**
	 * When reach the end tag, fire this operation
	 * 
	 * @see javax.servlet.jsp.tagext.BodyTagSupport#doEndTag()
	 */
	public int doEndTag( ) throws JspException
	{
		try
		{
			if ( __validate( ) )
			{
				// included in parameterpage tag
				this.requesterTag = (RequesterTag) TagSupport
						.findAncestorWithClass( this, RequesterTag.class );
				if ( requesterTag != null )
				{
					this.viewer = requesterTag.viewer;
					if ( this.viewer.isCustom( ) )
					{
						__beforeEndTag( );
						__process( );
					}
				}
			}
		}
		catch ( Exception e )
		{
			__handleException( e );
		}
		return super.doEndTag( );
	}

	/**
	 * validate the tag
	 * 
	 * @return
	 * @throws Exception
	 */
	protected boolean __validate( ) throws Exception
	{
		if ( !param.validate( ) )
			return false;

		// validate parameter id if valid
		Pattern p = Pattern.compile( "^\\w+$" ); //$NON-NLS-1$
		Matcher m = p.matcher( param.getId( ) );
		if ( !m.find( ) )
		{
			throw new JspTagException( BirtResources
					.getMessage( ResourceConstants.TAGLIB_INVALID_ATTR_ID ) );
		}

		// validate parameter id if unique
		if ( pageContext.findAttribute( ATTR_ID + param.getId( ) ) != null )
		{
			throw new JspTagException( BirtResources
					.getMessage( ResourceConstants.TAGLIB_ATTR_ID_DUPLICATE ) );
		}

		// validate parameter name if unique
		if ( this.requesterTag == null )
		{
			// the whole page scope
			if ( pageContext.findAttribute( ATTR_PARAM + param.getName( ) ) != null )
			{
				throw new JspTagException( BirtResources.getMessage(
						ResourceConstants.TAGLIB_PARAM_NAME_DUPLICATE,
						new String[]{param.getName( )} ) );
			}
		}
		else
		{
			// the form scope
			if ( this.requesterTag.getParameters( ).get( param.getName( ) ) != null )
				throw new JspTagException( BirtResources.getMessage(
						ResourceConstants.TAGLIB_PARAM_NAME_DUPLICATE,
						new String[]{param.getName( )} ) );
		}

		return true;
	}

	/**
	 * Handle event before doEndTag
	 */
	protected void __beforeEndTag( )
	{
		// Save parameter id
		pageContext.setAttribute( ATTR_ID + param.getId( ), param.getId( ) );

		// Save parameter name
		if ( this.requesterTag == null )
		{
			pageContext.setAttribute( ATTR_PARAM + param.getName( ), param
					.getName( ) );
		}
	}

	/**
	 * process tag function
	 * 
	 * @throws Exception
	 */
	protected void __process( ) throws Exception
	{
		if ( viewer == null )
			return;

		HttpServletRequest request = (HttpServletRequest) pageContext
				.getRequest( );
		this.locale = BirtTagUtil.getLocale( request, viewer.getLocale( ) );
		this.timeZone = BirtTagUtil.getTimeZone( request, viewer.getTimeZone() );

		// Create Input Options
		this.options = new InputOptions( );
		options.setOption( InputOptions.OPT_REQUEST, request );
		options.setOption( InputOptions.OPT_LOCALE, this.locale );
		options.setOption( InputOptions.OPT_TIMEZONE, this.timeZone );
		options.setOption( InputOptions.OPT_RTL, Boolean.valueOf( viewer
				.getRtl( ) ) );

		// get report parameter definition list
		Collection paramDefList = viewer.getParameterDefList( );
		if ( paramDefList == null )
		{
			// initialize engine context
			BirtReportServiceFactory.getReportService( ).setContext(
					pageContext.getServletContext( ), options );

			// get report design handle
			IViewerReportDesignHandle designHandle = BirtTagUtil
					.getDesignHandle( request, viewer );
			viewer.setReportDesignHandle( designHandle );

			paramDefList = BirtReportServiceFactory.getReportService( )
					.getParameterDefinitions( designHandle, options, false );
			viewer.setParameterDefList( paramDefList );
		}

		// find current parameter definition object
		this.paramDef = BirtUtility.findParameterDefinition( paramDefList,
				param.getName( ) );
		if ( paramDef == null )
			return;

		// data type
		String dataType = ParameterDataTypeConverter.convertDataType( paramDef
				.getDataType( ) );

		// pattern format
		this.pattern = param.getPattern( );
		if ( this.pattern == null )
			this.pattern = paramDef.getPattern( );

		if ( "true".equalsIgnoreCase( param.getIsLocale( ) ) ) //$NON-NLS-1$
			this.isLocale = true;
		else
			this.isLocale = false;

		// handle parameter value
		if ( param.getValue( ) != null )
		{
			if ( param.getValue( ) instanceof String )
			{
				// convert parameter value to object
				Object valueObj = DataUtil.validateWithPattern(
						param.getName( ), dataType, this.pattern,
						(String) param.getValue( ), locale, timeZone, isLocale );
				if ( this.paramDef.isMultiValue( ) )
					param.setValue( new Object[]{valueObj} );
				else
					param.setValue( valueObj );
			}
			else if ( this.paramDef.isMultiValue( )
					&& param.getValue( ) instanceof String[] )
			{
				// handle multi-value parameter
				String[] sValues = (String[]) param.getValue( );
				Object[] values = new Object[sValues.length];
				for ( int i = 0; i < sValues.length; i++ )
				{
					Object valueObj = DataUtil.validateWithPattern( param
							.getName( ), dataType, this.pattern, sValues[i],
							locale, timeZone, isLocale );
					values[i] = valueObj;
				}
				param.setValue( values );
			}
		}
		else
		{
			Object defaultValue = BirtReportServiceFactory.getReportService( )
					.getParameterDefaultValue( viewer.getReportDesignHandle( ),
							param.getName( ), options );
			if ( this.paramDef.isMultiValue( ) )
			{
				if ( !(defaultValue instanceof Object[]) )
				{
					defaultValue = new Object[]{defaultValue};
				}
			}
			
			param.setValue( defaultValue );
		}

		// handle value string
		if ( this.paramDef.isMultiValue( ) )
		{
			// handle multi-value parameter
			this.valueStringList = new ArrayList( );
			Object[] values = (Object[]) param.getValue( );
			if ( values != null )
			{
				for ( int i = 0; i < values.length; i++ )
				{
					String value = DataUtil.getDisplayValue( values[i], timeZone );
					this.valueStringList.add( value );
				}
			}
		}
		else
		{
			this.valueString = DataUtil.getDisplayValue( param.getValue( ), timeZone );
			if ( this.valueString == null )
				this.valueString = ""; //$NON-NLS-1$
		}

		// handle parameter display text
		this.displayTextString = param.getDisplayText( );
		if ( this.displayTextString == null )
		{
			Object obj = param.getValue( );
			if ( obj != null )
			{
				if ( obj instanceof Object[] )
				{
					Object[] objs = (Object[]) obj;
					if ( objs.length > 0 )
						obj = objs[0];
					else
						obj = null;
				}

				this.displayTextString = DataUtil
						.getDisplayValue( dataType, this.pattern, obj, locale, timeZone );
			}
		}
		if ( this.displayTextString == null )
			this.displayTextString = ""; //$NON-NLS-1$

		// handle title
		if ( param.getTitle( ) == null )
			param.setTitle( this.displayTextString );

		// cache parameter value
		requesterTag.addParameter( param.getName( ), param.getValue( ) );

		if ( paramDef.isHidden( ) )
		{
			// handle hidden parameter
			__handleHidden( );
		}
		else
		{
			// handle parameter section output
			switch ( paramDef.getControlType( ) )
			{
				case IScalarParameterDefn.TEXT_BOX :
					__handleTextBox( );
					break;
				case IScalarParameterDefn.LIST_BOX :
					__handleListBox( );
					break;
				case IScalarParameterDefn.RADIO_BUTTON :
					__handleRadioButton( );
					break;
				case IScalarParameterDefn.CHECK_BOX :
					__handleCheckBox( );
					break;
				default :
					break;
			}
		}
	}

	/**
	 * Handle output hidden type parameter
	 * 
	 * @throws Exception
	 */
	protected void __handleHidden( ) throws Exception
	{
		JspWriter writer = pageContext.getOut( );

		String encParamId = ParameterAccessor.htmlEncode( param.getId( ) );
		String encParamName = ParameterAccessor.htmlEncode( param.getName( ) );

		boolean isNullValue = param.getValue( ) == null;

		// parameter hidden value control
		writer.write( "<input type=\"hidden\" " ); //$NON-NLS-1$
		writer.write( " id=\"" + encParamId + "\" " ); //$NON-NLS-1$//$NON-NLS-2$
		if ( !isNullValue )
		{
			writer.write( " name=\"" + encParamName + "\" " ); //$NON-NLS-1$ //$NON-NLS-2$
			writer
					.write( " value=\"" + ParameterAccessor.htmlEncode( this.valueString ) + "\" " ); //$NON-NLS-1$ //$NON-NLS-2$
		}
		writer.write( " >\n" ); //$NON-NLS-1$

		// display text hidden object
		String displayTextId = encParamId + "_displayText"; //$NON-NLS-1$
		String displayTextName = ParameterAccessor.PREFIX_DISPLAY_TEXT
				+ encParamName;
		writer.write( "<input type=\"hidden\" " ); //$NON-NLS-1$
		writer.write( " id=\"" + displayTextId + "\" " ); //$NON-NLS-1$//$NON-NLS-2$
		if ( !isNullValue )
		{
			writer.write( " name=\"" + displayTextName + "\" " ); //$NON-NLS-1$ //$NON-NLS-2$
			writer
					.write( " value=\"" + ParameterAccessor.htmlEncode( this.displayTextString ) + "\" " ); //$NON-NLS-1$ //$NON-NLS-2$
		}
		writer.write( " >\n" ); //$NON-NLS-1$
	}

	/**
	 * Handle output general definitions for a control
	 * 
	 * @throws Exception
	 */
	protected void __handleGeneralDefinition( ) throws Exception
	{
		JspWriter writer = pageContext.getOut( );

		if ( param.getTitle( ) != null )
			writer.write( " title=\"" + param.getTitle( ) + "\" " ); //$NON-NLS-1$ //$NON-NLS-2$

		if ( param.getCssClass( ) != null )
			writer.write( " class=\"" + param.getCssClass( ) + "\" " ); //$NON-NLS-1$ //$NON-NLS-2$

		if ( param.getStyle( ) != null )
			writer.write( " style=\"" + param.getStyle( ) + "\" " ); //$NON-NLS-1$//$NON-NLS-2$
	}

	/**
	 * Handle output Text Box type parameter
	 * 
	 * @throws Exception
	 */
	protected void __handleTextBox( ) throws Exception
	{
		JspWriter writer = pageContext.getOut( );

		String encParamId = ParameterAccessor.htmlEncode( param.getId( ) );
		String encParamName = ParameterAccessor.htmlEncode( param.getName( ) );

		boolean isNullValue = param.getValue( ) == null;

		// display text hidden object
		String displayTextId = encParamId + "_displayText"; //$NON-NLS-1$
		String displayTextName = ParameterAccessor.PREFIX_DISPLAY_TEXT
				+ encParamName;
		writer.write( "<input type=\"hidden\" " ); //$NON-NLS-1$
		writer.write( " id=\"" + displayTextId + "\" " ); //$NON-NLS-1$//$NON-NLS-2$
		if ( paramDef.isRequired( ) || !isNullValue )
		{
			writer.write( " name=\"" + displayTextName + "\" " ); //$NON-NLS-1$ //$NON-NLS-2$
			writer
					.write( " value=\"" + ParameterAccessor.htmlEncode( this.displayTextString ) + "\" " ); //$NON-NLS-1$ //$NON-NLS-2$
		}
		writer.write( " >\n" ); //$NON-NLS-1$

		// parameter value hidden object
		String valueId = encParamId + "_value"; //$NON-NLS-1$
		writer.write( "<input type=\"hidden\" " ); //$NON-NLS-1$
		writer.write( " id=\"" + valueId + "\" " ); //$NON-NLS-1$//$NON-NLS-2$
		writer.write( " name=\"" + encParamName + "\" " ); //$NON-NLS-1$ //$NON-NLS-2$
		writer
				.write( " value=\"" + ParameterAccessor.htmlEncode( this.valueString ) + "\" " ); //$NON-NLS-1$ //$NON-NLS-2$
		writer.write( " >\n" ); //$NON-NLS-1$

		// isLocale hidden object
		String isLocaleId = encParamId + "_islocale"; //$NON-NLS-1$
		writer
				.write( "<input type=\"hidden\" id=\"" + isLocaleId + "\" value=\"" //$NON-NLS-1$ //$NON-NLS-2$
						+ encParamName + "\" >\n" ); //$NON-NLS-1$

		// set parameter pattern format
		String patternId = encParamId + "_pattern"; //$NON-NLS-1$
		String patternName = encParamName + "_format"; //$NON-NLS-1$
		if ( param.getPattern( ) != null )
		{
			writer.write( "<input type = 'hidden' id=\"" + patternId + "\" \n" ); //$NON-NLS-1$ //$NON-NLS-2$
			writer
					.write( " value=\"" + ParameterAccessor.htmlEncode( param.getPattern( ) ) + "\">\n" ); //$NON-NLS-1$//$NON-NLS-2$
		}

		// onchange script
		writer.write( "\n<script language=\"JavaScript\">\n" ); //$NON-NLS-1$
		writer.write( "function handleParam" + encParamId + "( )\n" ); //$NON-NLS-1$ //$NON-NLS-2$
		writer.write( "{\n" ); //$NON-NLS-1$
		writer.write( "var inputCtl = document.getElementById(\"" + encParamId //$NON-NLS-1$
				+ "\");\n" ); //$NON-NLS-1$
		writer.write( "var valCtl = document.getElementById(\"" + valueId //$NON-NLS-1$
				+ "\");\n" ); //$NON-NLS-1$
		writer.write( "var displayCtl = document.getElementById(\"" //$NON-NLS-1$
				+ displayTextId + "\");\n" ); //$NON-NLS-1$
		writer.write( "var localeCtl = document.getElementById(\"" //$NON-NLS-1$
				+ isLocaleId + "\");\n" ); //$NON-NLS-1$
		writer.write( "var patternCtl = document.getElementById(\"" //$NON-NLS-1$
				+ patternId + "\");\n" ); //$NON-NLS-1$
		writer.write( "displayCtl.value=inputCtl.value;\n" ); //$NON-NLS-1$
		writer.write( "valCtl.value=inputCtl.value;\n" ); //$NON-NLS-1$
		writer
				.write( "localeCtl.name='" + ParameterAccessor.PARAM_ISLOCALE + "';\n" ); //$NON-NLS-1$ //$NON-NLS-2$
		writer
				.write( "if( patternCtl ) patternCtl.name=\"" + patternName + "\";\n" ); //$NON-NLS-1$ //$NON-NLS-2$		
		writer.write( "}\n" ); //$NON-NLS-1$
		writer.write( "</script>\n" ); //$NON-NLS-1$

		String controlType = paramDef.concealValue( ) ? "PASSWORD" : "TEXT"; //$NON-NLS-1$ //$NON-NLS-2$
		if ( paramDef.isRequired( ) )
		{
			writer.write( "<input type=\"" + controlType + "\" " ); //$NON-NLS-1$ //$NON-NLS-2$
			writer.write( " id=\"" + encParamId + "\" " ); //$NON-NLS-1$//$NON-NLS-2$
			__handleGeneralDefinition( );
			writer
					.write( " value=\"" + ParameterAccessor.htmlEncode( this.displayTextString ) + "\" " ); //$NON-NLS-1$ //$NON-NLS-2$ 
			writer.write( " onchange=\"handleParam" + encParamId + "( )\"" ); //$NON-NLS-1$ //$NON-NLS-2$
			writer.write( " >\n" ); //$NON-NLS-1$			
		}
		else
		{
			String nullValueId = encParamId + "_null"; //$NON-NLS-1$
			String radioTextValueId = encParamId + "_radio_input"; //$NON-NLS-1$
			String radioNullValueId = encParamId + "_radio_null"; //$NON-NLS-1$

			// onclick script
			writer.write( "\n<script language=\"JavaScript\">\n" ); //$NON-NLS-1$
			writer.write( "function switchParam" + encParamId + "( flag )\n" ); //$NON-NLS-1$ //$NON-NLS-2$
			writer.write( "{\n" ); //$NON-NLS-1$
			writer
					.write( "var inputCtl = document.getElementById(\"" + encParamId //$NON-NLS-1$
							+ "\");\n" ); //$NON-NLS-1$
			writer.write( "var displayCtl = document.getElementById(\"" //$NON-NLS-1$
					+ displayTextId + "\");\n" ); //$NON-NLS-1$
			writer
					.write( "var nullCtl = document.getElementById(\"" + nullValueId //$NON-NLS-1$
							+ "\");\n" ); //$NON-NLS-1$
			writer
					.write( "var radioTextCtl = document.getElementById(\"" + radioTextValueId //$NON-NLS-1$
							+ "\");\n" ); //$NON-NLS-1$
			writer
					.write( "var radioNullCtl = document.getElementById(\"" + radioNullValueId //$NON-NLS-1$
							+ "\");\n" ); //$NON-NLS-1$
			writer.write( "if( flag ) \n" ); //$NON-NLS-1$
			writer.write( "{\n" ); //$NON-NLS-1$
			writer.write( "	radioTextCtl.checked=true;\n" ); //$NON-NLS-1$
			writer.write( "	radioNullCtl.checked=false;\n" ); //$NON-NLS-1$
			writer.write( "	inputCtl.disabled=false;\n" ); //$NON-NLS-1$		
			writer.write( "	nullCtl.name='';\n" ); //$NON-NLS-1$
			writer.write( "	displayCtl.name='" + displayTextName + "';\n" ); //$NON-NLS-1$ //$NON-NLS-2$
			writer.write( "}\n" ); //$NON-NLS-1$
			writer.write( "else\n" ); //$NON-NLS-1$
			writer.write( "{\n" ); //$NON-NLS-1$
			writer.write( "	radioTextCtl.checked=false;\n" ); //$NON-NLS-1$
			writer.write( "	radioNullCtl.checked=true;\n" ); //$NON-NLS-1$
			writer.write( "	inputCtl.disabled=true;\n" ); //$NON-NLS-1$		
			writer
					.write( "	nullCtl.name='" + ParameterAccessor.PARAM_ISNULL + "';\n" ); //$NON-NLS-1$ //$NON-NLS-2$
			writer.write( "	displayCtl.name='';\n" ); //$NON-NLS-1$
			writer.write( "}\n" ); //$NON-NLS-1$			
			writer.write( "}\n" ); //$NON-NLS-1$
			writer.write( "</script>\n" ); //$NON-NLS-1$

			// Null Value hidden object
			writer.write( "<input type=\"hidden\" value=\"" //$NON-NLS-1$
					+ encParamName + "\" id=\"" + nullValueId + "\"" ); //$NON-NLS-1$ //$NON-NLS-2$
			if ( isNullValue )
				writer.write( " name=\"" //$NON-NLS-1$
						+ ParameterAccessor.PARAM_ISNULL + "\"" ); //$NON-NLS-1$
			writer.write( " >\n" ); //$NON-NLS-1$

			writer
					.write( "<input type=\"radio\" id=\"" + radioTextValueId + "\" " ); //$NON-NLS-1$//$NON-NLS-2$
			writer.write( " onclick=\"switchParam" + encParamId + "( true )\"" ); //$NON-NLS-1$ //$NON-NLS-2$
			if ( !isNullValue )
				writer.write( " checked " ); //$NON-NLS-1$
			writer.write( " >\n" ); //$NON-NLS-1$

			writer.write( "<input type=\"" + controlType + "\" " ); //$NON-NLS-1$ //$NON-NLS-2$
			writer.write( " id=\"" + encParamId + "\" " ); //$NON-NLS-1$//$NON-NLS-2$
			__handleGeneralDefinition( );
			writer
					.write( " value=\"" + ParameterAccessor.htmlEncode( this.displayTextString ) + "\" " ); //$NON-NLS-1$ //$NON-NLS-2$ 
			writer.write( " onchange=\"handleParam" + encParamId + "( )\"" ); //$NON-NLS-1$ //$NON-NLS-2$
			if ( isNullValue )
				writer.write( " disabled = 'true' " ); //$NON-NLS-1$
			writer.write( " >\n" ); //$NON-NLS-1$

			writer
					.write( "<input type=\"radio\" id=\"" + radioNullValueId + "\" " ); //$NON-NLS-1$//$NON-NLS-2$
			writer
					.write( " onclick=\"switchParam" + encParamId + "( false )\"" ); //$NON-NLS-1$ //$NON-NLS-2$
			if ( isNullValue )
				writer.write( " checked " ); //$NON-NLS-1$
			writer.write( " >" ); //$NON-NLS-1$
			writer
					.write( "<label id=\"" + ( radioNullValueId + "_label" ) + "\"" ); //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$
			writer.write( " title=\"" + IBirtConstants.NULL_VALUE_DISPLAY + "\"" ); //$NON-NLS-1$ //$NON-NLS-2$
			writer.write( " for=\"" + radioNullValueId + "\">" ); //$NON-NLS-1$//$NON-NLS-2$
			writer.write( IBirtConstants.NULL_VALUE_DISPLAY );
			writer.write( "</label>" ); //$NON-NLS-1$
			writer.write( "</input>\n" ); //$NON-NLS-1$
		}
	}

	/**
	 * Handle output List Box type parameter
	 * 
	 * @throws Exception
	 */
	protected void __handleListBox( ) throws Exception
	{
		if ( paramDef.getGroup( ) != null && paramDef.getGroup( ).cascade( ) )
		{
			JspWriter writer = pageContext.getOut( );

			// Only import necessary files once.
			if ( pageContext.findAttribute( IMPORT_FILES_ATTR ) == null )
			{
				String baseURL = "/webcontent/"; //$NON-NLS-1$
				if ( viewer.getBaseURL( ) != null )
				{
					baseURL = viewer.getBaseURL( ) + baseURL;
				}
				else
				{
					baseURL = ( (HttpServletRequest) pageContext.getRequest( ) )
							.getContextPath( )
							+ baseURL;
				}

				// style files
				writer.write( "\n<LINK REL=\"stylesheet\" HREF=\"" + baseURL //$NON-NLS-1$
						+ "birt/styles/style.css\" TYPE=\"text/css\">\n" ); //$NON-NLS-1$

				// lib files
				BirtTagUtil.writeExtScripts(writer, baseURL + "birt/ajax/", //$NON-NLS-1$
						new String[] {
						"lib/prototype.js", //$NON-NLS-1$
						"utility/Debug.js", //$NON-NLS-1$
						"utility/Constants.js", //$NON-NLS-1$
						"utility/BirtUtility.js", //$NON-NLS-1$
						"utility/BirtPosition.js", //$NON-NLS-1$
						"core/BirtSoapRequest.js", //$NON-NLS-1$
						"core/BirtEvent.js", //$NON-NLS-1$						
						"taglib/CascadingParameter.js", //$NON-NLS-1$
						"taglib/ParameterGroup.js", //$NON-NLS-1$
						"taglib/ParameterDefinition.js", //$NON-NLS-1$
						"taglib/SoapResponseHelper.js", //$NON-NLS-1$
						"taglib/ProgressBar.js"}); //$NON-NLS-1$

				// create ProgressBar div
				this.__createProgressBar( baseURL );

				BirtTagUtil.writeScript(writer,
					"var progressBar = new ProgressBar( \"progressBar\",\"mask\" );" + //$NON-NLS-1$
					"Constants.nullValue = \"" + IBirtConstants.NULL_VALUE + "\";\n" //$NON-NLS-1$ //$NON-NLS-2$
					);

				pageContext.setAttribute( IMPORT_FILES_ATTR, Boolean.TRUE );
			}

			this.groupObjName = "group_" + this.viewer.getId( ) + "_" + paramDef.getGroup( ).getName( );//$NON-NLS-1$ //$NON-NLS-2$
			if ( pageContext.findAttribute( this.groupObjName ) == null )
			{
				writer
						.write( "<script  language=\"JavaScript\">var " + this.groupObjName + " = new ParameterGroup( );</script>\n" ); //$NON-NLS-1$ //$NON-NLS-2$
				pageContext.setAttribute( this.groupObjName, Boolean.TRUE );
			}

			// get parameter list from cascading group
			Collection selectionList = getParameterSelectionListForCascadingGroup( );
			__handleCommonListBox( selectionList );
			__handleCascadingListBox( );
		}
		else
		{
			// get parameter list
			Collection selectionList = BirtReportServiceFactory
					.getReportService( ).getParameterSelectionList(
							viewer.getReportDesignHandle( ), options,
							param.getName( ) );

			if ( this.paramDef.isMultiValue( ) )
				__handleMultiListBox( selectionList );
			else
				__handleCommonListBox( selectionList );
		}

	}

	/**
	 * Create Progress bar div
	 * 
	 * @param baseURL
	 * @throws Exception
	 */
	protected void __createProgressBar( String baseURL ) throws Exception
	{
		JspWriter writer = pageContext.getOut( );
		
		writer
				.write( "<DIV ID=\"mask\" STYLE=\"display:none;position:absolute;z-index:200\">\n" ); //$NON-NLS-1$
		writer.write( "</DIV>\n" ); //$NON-NLS-1$

		writer
				.write( "<DIV ID=\"progressBar\" STYLE=\"display:none;position:absolute;z-index:300\">\n" ); //$NON-NLS-1$
		writer
				.write( "<TABLE WIDTH=\"250px\" CLASS=\"birtviewer_progressbar\" CELLSPACING=\"10px\">\n" ); //$NON-NLS-1$
		writer.write( "	<TR>\n" ); //$NON-NLS-1$
		writer.write( "		<TD ALIGN=\"center\">\n" ); //$NON-NLS-1$
		writer.write( "			<B>" //$NON-NLS-1$
				+ BirtResources.getMessage( "birt.viewer.progressbar.prompt" ) //$NON-NLS-1$
				+ "</B>\n" ); //$NON-NLS-1$
		writer.write( "		</TD>\n" ); //$NON-NLS-1$
		writer.write( "	</TR>\n" ); //$NON-NLS-1$
		writer.write( "	<TR>\n" ); //$NON-NLS-1$
		writer.write( "		<TD ALIGN=\"center\">\n" ); //$NON-NLS-1$
		writer.write( "			<IMG SRC=\"" + baseURL //$NON-NLS-1$
				+ "birt/images/Loading.gif\" ALT=\"Progress Bar Image\"/>\n" ); //$NON-NLS-1$
		writer.write( "		</TD>\n" ); //$NON-NLS-1$
		writer.write( "	</TR>\n" ); //$NON-NLS-1$
		writer.write( "	<TR>\n" ); //$NON-NLS-1$
		writer.write( "		<TD ALIGN=\"center\">\n" ); //$NON-NLS-1$
		writer
				.write( "			<DIV ID=\"cancelTaskButton\" STYLE=\"display:block\">\n" ); //$NON-NLS-1$
		writer.write( "				<TABLE WIDTH=\"100%\">\n" ); //$NON-NLS-1$
		writer.write( "					<TR>\n" ); //$NON-NLS-1$
		writer.write( "						<TD ALIGN=\"center\">\n" ); //$NON-NLS-1$
		writer.write( "							<INPUT TYPE=\"BUTTON\" VALUE=\"" //$NON-NLS-1$
				+ BirtResources.getMessage( "birt.viewer.dialog.cancel" ) //$NON-NLS-1$
				+ "\" \n" ); //$NON-NLS-1$
		writer.write( "									TITLE=\"" //$NON-NLS-1$
				+ BirtResources.getMessage( "birt.viewer.dialog.cancel" ) //$NON-NLS-1$
				+ "\" \n" ); //$NON-NLS-1$
		writer.write( "									CLASS=\"birtviewer_progressbar_button\"/>\n" ); //$NON-NLS-1$
		writer.write( "						</TD>\n" ); //$NON-NLS-1$
		writer.write( "					</TR>\n" ); //$NON-NLS-1$
		writer.write( "				</TABLE>\n" ); //$NON-NLS-1$
		writer.write( "			</DIV>\n" ); //$NON-NLS-1$
		writer.write( "		</TD>\n" ); //$NON-NLS-1$
		writer.write( "	</TR>\n" ); //$NON-NLS-1$
		writer.write( "</TABLE>\n" ); //$NON-NLS-1$
		writer.write( "</DIV>\n" ); //$NON-NLS-1$
		writer.write( "<INPUT TYPE=\"HIDDEN\" ID=\"taskid\" VALUE=''/>\n" ); //$NON-NLS-1$
	}

	/**
	 * Handle Multi-value List Box type parameter
	 * 
	 * @param selectionList
	 * 
	 * @throws Exception
	 */
	protected void __handleMultiListBox( Collection selectionList )
			throws Exception
	{
		JspWriter writer = pageContext.getOut( );

		String encParamId = ParameterAccessor.htmlEncode( param.getId( ) );
		String encParamName = ParameterAccessor.htmlEncode( param.getName( ) );

		String containerId = encParamId + "_container"; //$NON-NLS-1$		
		String displayTextName = ParameterAccessor.PREFIX_DISPLAY_TEXT
				+ encParamName;

		// function for handling select onchange
		String content =
		 "function handleParam" + encParamId + "( oCtl )\n" + //$NON-NLS-1$ //$NON-NLS-2$
		 "{\n" + //$NON-NLS-1$
		 "  if( !oCtl ) return;\n" + //$NON-NLS-1$
		 "  var container = document.getElementById(\"" + containerId + "\");\n" + //$NON-NLS-1$ //$NON-NLS-2$
		 " while( container.childNodes.length > 0)\n" + //$NON-NLS-1$
		 "{\n" + //$NON-NLS-1$
		 "  container.removeChild(container.firstChild);\n" + //$NON-NLS-1$		
		 "}\n" + //$NON-NLS-1$
		 "\n" + //$NON-NLS-1$
		 "  var options = oCtl.options;\n" + //$NON-NLS-1$			
		 "  for( var i = 0; i < options.length; i++ )\n" + //$NON-NLS-1$
		 "  {\n" + //$NON-NLS-1$
		 "    if( !options[i].selected ) continue;\n" + //$NON-NLS-1$
		 "\n" + //$NON-NLS-1$
		 "    var text = options[i].text;\n" + //$NON-NLS-1$
		 "    var value = options[i].value;\n" + //$NON-NLS-1$

		// null value
		 "\n" + //$NON-NLS-1$
		 "  if( value == '" + IBirtConstants.NULL_VALUE + "')\n" + //$NON-NLS-1$ //$NON-NLS-2$
		 "    {\n" + //$NON-NLS-1$
		 "      var oInput = document.createElement( 'input' );\n" + //$NON-NLS-1$
		 "      oInput.type = 'hidden';\n" + //$NON-NLS-1$
		 "      oInput.name = '" + ParameterAccessor.PARAM_ISNULL + "';\n" + //$NON-NLS-1$ //$NON-NLS-2$
		 "      oInput.value = \"" + encParamName + "\";\n" + //$NON-NLS-1$ //$NON-NLS-2$
		 "      container.appendChild( oInput );\n" + //$NON-NLS-1$
		 "    }\n" + //$NON-NLS-1$

		// parameter value
		 "\n" + //$NON-NLS-1$
		 "    var oInput = document.createElement( 'input' );\n" + //$NON-NLS-1$
		 "    oInput.type = 'hidden';\n" + //$NON-NLS-1$
		 "    oInput.name = \"" + encParamName + "\";\n" + //$NON-NLS-1$ //$NON-NLS-2$
		 "    oInput.value = value;\n" + //$NON-NLS-1$
		 "    container.appendChild( oInput );\n" + //$NON-NLS-1$

		// display text
		 "\n" + //$NON-NLS-1$
		 "    var oInput = document.createElement( 'input' );\n" + //$NON-NLS-1$
		 "    oInput.type = 'hidden';\n" + //$NON-NLS-1$
		 "    oInput.name = \"" + displayTextName + "\";\n" + //$NON-NLS-1$ //$NON-NLS-2$
		 "    oInput.value = text;\n" + //$NON-NLS-1$
		 "    container.appendChild( oInput );\n" + //$NON-NLS-1$				
		 "  }\n"; //$NON-NLS-1$

		// isLocale
		if ( this.isLocale )
		{
			content += "\n" + //$NON-NLS-1$
			"  var oInput = document.createElement( 'input' );\n" + //$NON-NLS-1$
			"  oInput.type = 'hidden';\n" + //$NON-NLS-1$
			"  oInput.name = \"" + ParameterAccessor.PARAM_ISLOCALE + "\";\n" + //$NON-NLS-1$ //$NON-NLS-2$
			"  oInput.value = \"" + encParamName + "\";\n" + //$NON-NLS-1$ //$NON-NLS-2$
			"  container.appendChild( oInput );\n"; //$NON-NLS-1$
		}

		content += "}\n"; //$NON-NLS-1$
		BirtTagUtil.writeScript(writer, content);

		String onChange = "handleParam" + encParamId + "( this )"; //$NON-NLS-1$ //$NON-NLS-2$

		// parameter container
		writer
				.write( "<div id=\"" + containerId + "\" style=\"display:none;\"></div>" ); //$NON-NLS-1$ //$NON-NLS-2$

		// select control
		writer.write( "<select " ); //$NON-NLS-1$
		writer.write( " id=\"" + encParamId + "\"" ); //$NON-NLS-1$//$NON-NLS-2$			
		__handleGeneralDefinition( );
		writer.write( " onchange=\"" + onChange + "\"" ); //$NON-NLS-1$ //$NON-NLS-2$
		writer.write( " multiple='true'" ); //$NON-NLS-1$
		writer.write( " >\n" ); //$NON-NLS-1$

		makeOption( writer, selectionList, this.valueStringList );

		writer.write( "</select>\n" ); //$NON-NLS-1$

		BirtTagUtil.writeScript(writer,
			 "var selectCtl = document.getElementById(\"" //$NON-NLS-1$
					+ encParamId + "\");\n" + //$NON-NLS-1$
			 "if( selectCtl.options.length > 8 )\n" + //$NON-NLS-1$
			 "  selectCtl.size = 8;\n" + //$NON-NLS-1$
			 "else\n" + //$NON-NLS-1$
			 "  selectCtl.size = selectCtl.options.length;\n" + //$NON-NLS-1$
			 "handleParam" + encParamId + "( selectCtl );\n" //$NON-NLS-1$ //$NON-NLS-2$
			 );
	}

	/**
	 * @param writer
	 * @param items
	 * @throws IOException
	 */
	private void makeOption( JspWriter writer, Collection items,
			List selectedItems ) throws IOException
	{
		boolean nullValueFound = false;
		// blank item
		if ( !paramDef.isRequired( ) )
		{
			BirtTagUtil.writeOption( writer, "", "", DataUtil.contain(  //$NON-NLS-1$//$NON-NLS-2$
					this.valueStringList, "", true ) ); //$NON-NLS-1$
		}

		// selection list
		for ( Iterator iter = items.iterator( ); iter.hasNext( ); )
		{
			ParameterSelectionChoice selectionItem = (ParameterSelectionChoice) iter
					.next( );

			Object value = selectionItem.getValue( );
			try
			{
				// try convert value to parameter definition data type
				value = DataUtil.convert( value, paramDef.getDataType( ) );
			}
			catch ( Exception e )
			{
				value = null;
			}

			// Convert parameter value using standard format
			String displayValue = DataUtil.getDisplayValue( value, timeZone );
			if ( value == null )
			{
				nullValueFound = true;
			}

			// If label is null or blank, then use the format parameter
			// value for display
			String label = selectionItem.getLabel( );
			if ( label == null || label.length( ) <= 0 )
				label = DataUtil.getDisplayValue( null, this.pattern, value,
						this.locale, this.timeZone );

			label = label != null ? label : ""; //$NON-NLS-1$

			BirtTagUtil.writeOption( writer, label, ( displayValue == null )
					? IBirtConstants.NULL_VALUE
					: displayValue, DataUtil.contain( selectedItems,
					displayValue, true ) );
		}

		// null value item
		if ( !paramDef.isRequired( ) && !nullValueFound )
		{
			BirtTagUtil.writeOption( writer, IBirtConstants.NULL_VALUE_DISPLAY,
					IBirtConstants.NULL_VALUE, DataUtil.contain( selectedItems,
							null, true ) );
		}
	}

	/**
	 * Handle Common List/Combo Box type parameter( not cascading parameter )
	 * 
	 * @param selectionList
	 * 
	 * @throws Exception
	 */
	protected void __handleCommonListBox( Collection selectionList )
			throws Exception
	{
		JspWriter writer = pageContext.getOut( );

		String encParamId = ParameterAccessor.htmlEncode( param.getId( ) );
		String encParamName = ParameterAccessor.htmlEncode( param.getName( ) );

		String displayTextId = encParamId + "_displayText"; //$NON-NLS-1$
		String displayTextName = ParameterAccessor.PREFIX_DISPLAY_TEXT
				+ encParamName;

		boolean isSelected = false;
		boolean isNullValue = param.getValue( ) == null;
		String valueId = encParamId + "_value"; //$NON-NLS-1$
		String nullValueId = encParamId + "_null"; //$NON-NLS-1$

		String radioSelectId = encParamId + "_radio_select"; //$NON-NLS-1$
		String radioTextId = encParamId + "_radio_input"; //$NON-NLS-1$
		String inputTextId = encParamId + "_input"; //$NON-NLS-1$

		String isLocaleId = encParamId + "_islocale"; //$NON-NLS-1$		
		String patternId = encParamId + "_pattern"; //$NON-NLS-1$
		String patternName = encParamName + "_format"; //$NON-NLS-1$

		if ( !paramDef.mustMatch( ) )
		{
			BirtTagUtil.writeScript(writer,
			// function for updating controls status
			 "function updateParam" + encParamId + "( flag )\n"  + //$NON-NLS-1$ //$NON-NLS-2$
			 "{\n"  + //$NON-NLS-1$
			"var radioSelectCtl = document.getElementById(\"" + radioSelectId + "\");\n"  + //$NON-NLS-1$//$NON-NLS-2$
			 "if( radioSelectCtl ) radioSelectCtl.checked = flag;\n"  + //$NON-NLS-1$
			"var radioTextCtl = document.getElementById(\"" + radioTextId + "\");\n"  + //$NON-NLS-1$//$NON-NLS-2$
			 "if( radioTextCtl ) radioTextCtl.checked = !flag;\n"  + //$NON-NLS-1$
			 "var selectCtl = document.getElementById(\"" + encParamId + "\");\n"  + //$NON-NLS-1$//$NON-NLS-2$
			 "if( selectCtl ) selectCtl.disabled = !flag;\n"  + //$NON-NLS-1$
			"var inputCtl = document.getElementById(\"" + inputTextId + "\");\n"  + //$NON-NLS-1$//$NON-NLS-2$
			 "if( inputCtl ) inputCtl.disabled = flag;\n"  + //$NON-NLS-1$			

			// If input parameter in text field,enable locale control
			"var localeCtl = document.getElementById(\"" + isLocaleId + "\");\n"  + //$NON-NLS-1$//$NON-NLS-2$
			 "if( localeCtl )\n"  + //$NON-NLS-1$
			 "{\n"  + //$NON-NLS-1$
			 "  if( flag )\n"  + //$NON-NLS-1$
			 "    localeCtl.name = '';\n"  + //$NON-NLS-1$
			 "  else\n"  + //$NON-NLS-1$
			 "    localeCtl.name = \"" //$NON-NLS-1$
					+ ParameterAccessor.PARAM_ISLOCALE + "\";\n"  + //$NON-NLS-1$
			 "}\n"  + //$NON-NLS-1$

			 "if( flag )\n"  + //$NON-NLS-1$
			 "{\n"  + //$NON-NLS-1$
			 "  if( selectCtl.selectedIndex >= 0 )\n"  + //$NON-NLS-1$
			"    handleParam" + encParamId + "( selectCtl.options[selectCtl.selectedIndex] );\n"  + //$NON-NLS-1$ //$NON-NLS-2$
			 "  else\n"  + //$NON-NLS-1$
			 "  {\n"  + //$NON-NLS-1$
			"    var nullCtl = document.getElementById(\"" + nullValueId + "\");\n"  + //$NON-NLS-1$//$NON-NLS-2$
			"    if( nullCtl ) nullCtl.name=\"" + ParameterAccessor.PARAM_ISNULL //$NON-NLS-1$
							+ "\";\n"  + //$NON-NLS-1$
			"    var valCtl = document.getElementById(\"" + valueId //$NON-NLS-1$
							+ "\");\n"  + //$NON-NLS-1$
			 "    if( valCtl ) valCtl.name = '';\n"  + //$NON-NLS-1$
			 "    if( valCtl ) valCtl.value = '';\n"  + //$NON-NLS-1$
			 "    var displayCtl = document.getElementById(\"" //$NON-NLS-1$
					+ displayTextId + "\");\n"  + //$NON-NLS-1$			
			 "    if( displayCtl ) displayCtl.value = '';\n"  + //$NON-NLS-1$
			 "    if( displayCtl ) displayCtl.name = '';\n"  + //$NON-NLS-1$
			 "  }\n"  + //$NON-NLS-1$
			 "}\n"  + //$NON-NLS-1$
			 "else\n"  + //$NON-NLS-1$
			 "{\n"  + //$NON-NLS-1$
			 "  handleTextParam" + encParamId + "( );\n"  + //$NON-NLS-1$ //$NON-NLS-2$			
			 "}\n"  + //$NON-NLS-1$

			 "}\n"  + //$NON-NLS-1$

			// function for handling text input
			 "function handleTextParam" + encParamId + "( )\n"  + //$NON-NLS-1$ //$NON-NLS-2$
			 "{\n"  + //$NON-NLS-1$
			"var inputCtl = document.getElementById(\"" + inputTextId //$NON-NLS-1$
							+ "\");\n"  + //$NON-NLS-1$		

			 "var valCtl = document.getElementById(\"" + valueId //$NON-NLS-1$
					+ "\");\n"  + //$NON-NLS-1$
			"if( valCtl ) valCtl.name = \"" + encParamName + "\";\n"  + //$NON-NLS-1$//$NON-NLS-2$		
			 "if( valCtl ) valCtl.value = inputCtl.value;\n"  + //$NON-NLS-1$

			 "var displayCtl = document.getElementById(\"" //$NON-NLS-1$
					+ displayTextId + "\");\n"  + //$NON-NLS-1$
			"if( displayCtl ) displayCtl.name = \"" + displayTextName + "\";\n"  + //$NON-NLS-1$ //$NON-NLS-2$
			"if( displayCtl ) displayCtl.value = inputCtl.value;\n"  + //$NON-NLS-1$

			"var nullCtl = document.getElementById(\"" + nullValueId + "\");\n"  + //$NON-NLS-1$//$NON-NLS-2$
			 "if( nullCtl ) nullCtl.name='';\n"  + //$NON-NLS-1$

			"var localeCtl = document.getElementById(\"" + isLocaleId + "\");\n"  + //$NON-NLS-1$//$NON-NLS-2$
			"if( localeCtl ) localeCtl.name = \"" + ParameterAccessor.PARAM_ISLOCALE + "\";\n"  + //$NON-NLS-1$ //$NON-NLS-2$

			 "}\n"  + //$NON-NLS-1$

			 "function changeTextParam" + encParamId + "( )\n"  + //$NON-NLS-1$ //$NON-NLS-2$
			 "{\n"  + //$NON-NLS-1$
			"var patternCtl = document.getElementById(\"" + patternId + "\");\n"  + //$NON-NLS-1$//$NON-NLS-2$
			"if( patternCtl ) patternCtl.name = \"" + patternName + "\";\n"  + //$NON-NLS-1$ //$NON-NLS-2$
			 "  handleTextParam" + encParamId + "( );\n"  + //$NON-NLS-1$ //$NON-NLS-2$		
			 "}\n"); //$NON-NLS-1$
		}

		BirtTagUtil.writeScript(writer,
			// onchange script
			 "function handleParam" + encParamId + "( option )\n"  + //$NON-NLS-1$ //$NON-NLS-2$
			 "{\n"  + //$NON-NLS-1$
			 "if( !option ) return;\n"  + //$NON-NLS-1$
	
			 "var valCtl = document.getElementById(\"" + valueId //$NON-NLS-1$
					+ "\");\n"  + //$NON-NLS-1$
			 "var displayCtl = document.getElementById(\"" //$NON-NLS-1$
					+ displayTextId + "\");\n"  + //$NON-NLS-1$
			 "var nullCtl = document.getElementById(\"" + nullValueId + "\");\n"  + //$NON-NLS-1$//$NON-NLS-2$
			 "var label = option.text;\n"  + //$NON-NLS-1$
			 "var value = option.value;\n"  + //$NON-NLS-1$
			 "if( value == \"" + IBirtConstants.NULL_VALUE + "\")\n"  + //$NON-NLS-1$//$NON-NLS-2$
			 "{\n"  + //$NON-NLS-1$
			 "  if( nullCtl ) nullCtl.name=\"" + ParameterAccessor.PARAM_ISNULL //$NON-NLS-1$
							+ "\";\n"  + //$NON-NLS-1$
			 "  if( valCtl ) valCtl.name = '';\n"  + //$NON-NLS-1$
			 "  if( valCtl ) valCtl.value = '';\n"  + //$NON-NLS-1$
			 "  if( displayCtl ) displayCtl.value = '';\n"  + //$NON-NLS-1$
			 "  if( displayCtl ) displayCtl.name = '';\n"  + //$NON-NLS-1$
			 "}\n"  + //$NON-NLS-1$
			 "else\n"  + //$NON-NLS-1$
			 "{\n"  + //$NON-NLS-1$
			 "  if( nullCtl ) nullCtl.name='';\n"  + //$NON-NLS-1$
			 "  if( valCtl ) valCtl.name = \"" + encParamName + "\";\n"  + //$NON-NLS-1$//$NON-NLS-2$
			 "  if( valCtl ) valCtl.value = value;\n"  + //$NON-NLS-1$		
			 "  if( displayCtl ) displayCtl.name = \"" + displayTextName + "\";\n"  + //$NON-NLS-1$ //$NON-NLS-2$
			 "  if( displayCtl ) displayCtl.value = label;\n"  + //$NON-NLS-1$
			 "}\n"  + //$NON-NLS-1$
				"}\n"//$NON-NLS-1$
			);

		String onChange = "handleParam" + encParamId + "( this.options[this.selectedIndex] )"; //$NON-NLS-1$ //$NON-NLS-2$
		if ( !paramDef.mustMatch( ) )
		{
			String onClick = "updateParam" + encParamId + "( true )"; //$NON-NLS-1$ //$NON-NLS-2$
			writer.write( "<input type=\"radio\" " ); //$NON-NLS-1$
			writer.write( " id=\"" + radioSelectId + "\"" ); //$NON-NLS-1$//$NON-NLS-2$
			writer.write( " onclick=\"" + onClick + "\"" ); //$NON-NLS-1$//$NON-NLS-2$
			writer.write( " >\n" ); //$NON-NLS-1$
		}

		// select control
		writer.write( "<select " ); //$NON-NLS-1$
		writer.write( " id=\"" + encParamId + "\"" ); //$NON-NLS-1$//$NON-NLS-2$			
		__handleGeneralDefinition( );
		writer.write( " onchange=\"" + onChange + "\"" ); //$NON-NLS-1$ //$NON-NLS-2$
		writer.write( " >\n" ); //$NON-NLS-1$

		// blank item
		if ( !paramDef.isRequired( ) )
		{
			if ( param.getValue( ) != null
					&& DataUtil.getString( param.getValue( ) ).length( ) <= 0 )
			{
				isSelected = true;
			}
			BirtTagUtil.writeOption( writer, "", "", isSelected);
		}

		boolean nullValueFound = false;
		for ( Iterator iter = selectionList.iterator( ); iter.hasNext( ); )
		{
			ParameterSelectionChoice selectionItem = (ParameterSelectionChoice) iter
					.next( );

			Object value = selectionItem.getValue( );
			try
			{
				// try convert value to parameter definition data type
				value = DataUtil.convert( value, paramDef.getDataType( ) );
			}
			catch ( Exception e )
			{
				value = null;
			}

			// Convert parameter value using standard format
			String displayValue = DataUtil.getDisplayValue( value, timeZone );

			// If label is null or blank, then use the format parameter
			// value for display
			String label = selectionItem.getLabel( );
			if ( label == null || label.length( ) <= 0 )
				label = DataUtil.getDisplayValue( null,
						this.pattern, value, this.locale, this.timeZone );

			if ( value == null )
			{
				nullValueFound = true;
				if ( label == null )
				{
					label = IBirtConstants.NULL_VALUE_DISPLAY;
				}				
			}
			
			label = label != null ? label : ""; //$NON-NLS-1$
			boolean selected = false;
			if ( DataUtil.equals( displayValue, DataUtil.getDisplayValue( param
					.getValue( ), timeZone ) ) )
			{
				selected = true;
				isSelected = true;
				writer.write( " selected" ); //$NON-NLS-1$
				if ( param.getDisplayText( ) == null )
				{
					this.displayTextString = label;
				}
				else
				{
					label = param.getDisplayText( );
				}
			}
			
			BirtTagUtil.writeOption( writer, label, ( displayValue == null )
					? IBirtConstants.NULL_VALUE
					: displayValue, selected );
		}

		String defaultValueText = null;
		if ( !isSelected )
		{
			Object defaultValue = BirtReportServiceFactory.getReportService( )
					.getParameterDefaultValue( viewer.getReportDesignHandle( ),
							param.getName( ), options );
			if ( defaultValue == null )
			{
				isNullValue = true;
			}
			else
			{
				isNullValue = false;
				defaultValueText = DataUtil.getDisplayValue( defaultValue, timeZone );
				if ( this.valueString.equalsIgnoreCase( defaultValueText )
						|| paramDef.mustMatch( ) )
				{
					if ( defaultValueText != null )
						this.valueString = defaultValueText;

					String defaultDisplayText = DataUtil
							.getDisplayValue( null, this.pattern, defaultValue,
									locale, this.timeZone );
					if ( defaultDisplayText != null )
						this.displayTextString = defaultDisplayText;

					BirtTagUtil.writeOption(writer, this.displayTextString, this.valueString, true);
					isSelected = true;
				}
			}
		}

		// null value item
		if ( !paramDef.isRequired( ) && !nullValueFound )
		{
			BirtTagUtil.writeOption( writer, IBirtConstants.NULL_VALUE_DISPLAY,
					IBirtConstants.NULL_VALUE, isNullValue );
			isSelected = true;
		}

		writer.write( "</select>\n" ); //$NON-NLS-1$

		if ( !paramDef.mustMatch( ) )
		{
			// isLocale hidden object
			writer.write( "<input type = 'hidden' " ); //$NON-NLS-1$
			writer.write( " id=\"" + isLocaleId + "\" " ); //$NON-NLS-1$ //$NON-NLS-2$
			writer.write( " value=\"" + encParamName + "\" " ); //$NON-NLS-1$ //$NON-NLS-2$
			writer.write( " >\n" ); //$NON-NLS-1$

			// set parameter pattern format
			if ( param.getPattern( ) != null )
			{
				writer
						.write( "<input type = 'hidden' id=\"" + patternId + "\"" ); //$NON-NLS-1$ //$NON-NLS-2$
				writer
						.write( " value=\"" + ParameterAccessor.htmlEncode( param.getPattern( ) ) + "\">\n" ); //$NON-NLS-1$//$NON-NLS-2$
			}

			String onClick = "updateParam" + encParamId + "( false );"; //$NON-NLS-1$ //$NON-NLS-2$			
			writer.write( "<input type=\"radio\" " ); //$NON-NLS-1$
			writer.write( " id=\"" + radioTextId + "\"" ); //$NON-NLS-1$//$NON-NLS-2$
			writer.write( " onclick=\"" + onClick + "\"" ); //$NON-NLS-1$//$NON-NLS-2$
			writer.write( " >\n" ); //$NON-NLS-1$

			writer.write( "<input type=\"text\" " ); //$NON-NLS-1$
			writer.write( " id=\"" + inputTextId + "\"" ); //$NON-NLS-1$//$NON-NLS-2$
			if ( !isSelected )
			{
				writer
						.write( " value=\"" + ParameterAccessor.htmlEncode( this.displayTextString ) + "\"" ); //$NON-NLS-1$ //$NON-NLS-2$
			}
			writer.write( " onchange=\"changeTextParam" + encParamId + "( )\"" ); //$NON-NLS-1$ //$NON-NLS-2$
			writer.write( " >\n" ); //$NON-NLS-1$

			// initialize controls
			writer
					.write( "<script language=\"JavaScript\">updateParam" + encParamId + "(" + isSelected + ");</script>\n" ); //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$
		}

		// display text hidden object
		writer.write( "<input type=\"hidden\" " ); //$NON-NLS-1$
		writer.write( " id=\"" + displayTextId + "\" " ); //$NON-NLS-1$//$NON-NLS-2$
		if ( !isNullValue )
		{
			writer.write( " name=\"" + displayTextName + "\" " ); //$NON-NLS-1$ //$NON-NLS-2$
			writer
					.write( " value=\"" + ParameterAccessor.htmlEncode( this.displayTextString ) + "\" " ); //$NON-NLS-1$ //$NON-NLS-2$ 

		}
		writer.write( " >\n" ); //$NON-NLS-1$

		// parameter value hidden object
		writer.write( "<input type=\"hidden\" " ); //$NON-NLS-1$
		writer.write( " id=\"" + valueId + "\" " ); //$NON-NLS-1$//$NON-NLS-2$
		if ( !isNullValue )
		{
			writer.write( " name=\"" + encParamName + "\" " ); //$NON-NLS-1$ //$NON-NLS-2$
			writer
					.write( " value=\"" + ParameterAccessor.htmlEncode( this.valueString ) + "\" " ); //$NON-NLS-1$ //$NON-NLS-2$
		}
		writer.write( " >\n" ); //$NON-NLS-1$

		// Null Value hidden object
		if ( !paramDef.isRequired( ) )
		{
			writer.write( "<input type=\"hidden\" value=\"" //$NON-NLS-1$
					+ encParamName + "\" id=\"" + nullValueId + "\"" ); //$NON-NLS-1$ //$NON-NLS-2$
			if ( isNullValue )
				writer.write( " name=\"" //$NON-NLS-1$
						+ ParameterAccessor.PARAM_ISNULL + "\"" ); //$NON-NLS-1$
			writer.write( " >\n" ); //$NON-NLS-1$
		}

		if ( !isSelected && paramDef.mustMatch( ) )
		{
			writer.write( "\n<script language=\"JavaScript\">\n" ); //$NON-NLS-1$
			writer.write( "var selectCtl = document.getElementById(\"" //$NON-NLS-1$
					+ encParamId + "\");\n" ); //$NON-NLS-1$
			writer.write( "if( selectCtl.selectedIndex >= 0 )\n" ); //$NON-NLS-1$
			writer.write( "{\n" ); //$NON-NLS-1$
			if ( defaultValueText != null )
			{
				writer.write( "  selectCtl.value = \"" + defaultValueText //$NON-NLS-1$
						+ "\";\n" ); //$NON-NLS-1$
			}
			writer
					.write( "  handleParam" + encParamId + "( selectCtl.options[selectCtl.selectedIndex] );\n" ); //$NON-NLS-1$ //$NON-NLS-2$				
			writer.write( "}\n" ); //$NON-NLS-1$
			writer.write( "</script>\n" ); //$NON-NLS-1$
		}
	}

	/**
	 * Handle Cascading List Box type parameter
	 * 
	 * @throws Exception
	 */
	protected void __handleCascadingListBox( ) throws Exception
	{
		String encParamId = ParameterAccessor.htmlEncode( param.getId( ) );
		String encParamName = ParameterAccessor.htmlEncode( param.getName( ) );
		String inputTextId = encParamId + "_input"; //$NON-NLS-1$

		JspWriter writer = pageContext.getOut( );

		BirtTagUtil.writeScript( writer, 
			"var param = new ParameterDefinition(\"" + encParamId + "\",\"" + encParamName + "\");\n" + //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$
			"param.setRequired(" + paramDef.isRequired( ) + ");\n" + //$NON-NLS-1$ //$NON-NLS-2$
			this.groupObjName + ".addParameter( param );\n"  //$NON-NLS-1$
			);
		ParameterGroupDefinition group = (ParameterGroupDefinition) paramDef
				.getGroup( );
		int index = group.getParameters( ).indexOf( paramDef );

		// if it is the last cascading parameter, return
		if ( index == group.getParameterCount( ) - 1 )
			return;

		String casObj = "cas" + encParamId; //$NON-NLS-1$
		String namesObj = "names_" + encParamId; //$NON-NLS-1$
		writer.write( "\n<script language=\"JavaScript\">\n" ); //$NON-NLS-1$
		writer
				.write( "var " + namesObj + " = new Array( " + ( index + 2 ) + " );\n" ); //$NON-NLS-1$//$NON-NLS-2$ //$NON-NLS-3$
		for ( int i = 0; i < index + 2; i++ )
		{
			ParameterDefinition param = (ParameterDefinition) group
					.getParameters( ).get( i );
			writer.write( namesObj + "[" + i + "] = \"" //$NON-NLS-1$ //$NON-NLS-2$
					+ ParameterAccessor.htmlEncode( param.getName( ) )
					+ "\";\n" ); //$NON-NLS-1$
		}
		writer
				.write( "var " + casObj + " = new CascadingParameter( \"" + this.viewer.getId( ) + "\", param, " + namesObj + ", " + this.groupObjName + " );\n" ); //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$ //$NON-NLS-4$ //$NON-NLS-5$
		writer
				.write( "var selectCtl = document.getElementById(\"" + encParamId + "\");\n" ); //$NON-NLS-1$//$NON-NLS-2$
		writer.write( "selectCtl.onchange = function( ) { \n" ); //$NON-NLS-1$
		writer.write( "var selectCtl = document.getElementById(\"" + encParamId //$NON-NLS-1$
				+ "\");\n" ); //$NON-NLS-1$
		writer.write( "handleParam" + encParamId //$NON-NLS-1$
				+ "( selectCtl.options[selectCtl.selectedIndex] );\n" ); //$NON-NLS-1$
		writer.write( "progressBar.setHandler(" + casObj + ");\n" ); //$NON-NLS-1$ //$NON-NLS-2$
		writer.write( casObj + ".process( ); };\n" ); //$NON-NLS-1$
		writer
				.write( "var inputCtl = document.getElementById(\"" + inputTextId + "\");\n" ); //$NON-NLS-1$//$NON-NLS-2$
		writer.write( "if( inputCtl )\n" ); //$NON-NLS-1$
		writer.write( "{\n" ); //$NON-NLS-1$
		writer.write( "inputCtl.onchange = function( ) { \n" ); //$NON-NLS-1$
		writer.write( "handleTextParam" + encParamId + "( );\n" ); //$NON-NLS-1$ //$NON-NLS-2$
		writer.write( "progressBar.setHandler(" + casObj + ");\n" ); //$NON-NLS-1$ //$NON-NLS-2$
		writer.write( casObj + ".process( ); };\n" ); //$NON-NLS-1$
		writer.write( "}\n" ); //$NON-NLS-1$
		writer.write( "</script>\n" ); //$NON-NLS-1$
	}

	/**
	 * Get parameter selection list from cascading parameter
	 * 
	 * @return
	 * @throws ReportServiceException
	 */
	private Collection getParameterSelectionListForCascadingGroup( )
			throws ReportServiceException
	{

		ParameterGroupDefinition group = (ParameterGroupDefinition) paramDef
				.getGroup( );
		int index = group.getParameters( ).indexOf( paramDef );
		Object[] groupKeys = new Object[index];
		for ( int i = 0; i < index; i++ )
		{
			ParameterDefinition def = (ParameterDefinition) group
					.getParameters( ).get( i );
			String parameterName = def.getName( );
			groupKeys[i] = requesterTag.getParameters( ).get( parameterName );
		}
		return BirtReportServiceFactory.getReportService( )
				.getSelectionListForCascadingGroup(
						viewer.getReportDesignHandle( ), group.getName( ),
						groupKeys, options );
	}

	/**
	 * Handle output Radio Button type parameter
	 * 
	 * @throws Exception
	 */
	protected void __handleRadioButton( ) throws Exception
	{
		Collection selectionList = BirtReportServiceFactory.getReportService( )
				.getParameterSelectionList( viewer.getReportDesignHandle( ),
						this.options, param.getName( ) );
		if ( selectionList == null || selectionList.size( ) <= 0 )
			return;

		JspWriter writer = pageContext.getOut( );

		String encParamId = ParameterAccessor.htmlEncode( param.getId( ) );
		String encParamName = ParameterAccessor.htmlEncode( param.getName( ) );

		String displayTextId = encParamId + "_displayText"; //$NON-NLS-1$
		String displayTextName = ParameterAccessor.PREFIX_DISPLAY_TEXT
				+ encParamName;

		String nullValueId = encParamId + "_null"; //$NON-NLS-1$
		String radioNullValueId = encParamId + "_radio_null"; //$NON-NLS-1$

		String radioName = encParamId + "_radio"; //$NON-NLS-1$
		String valueId = encParamId + "_value"; //$NON-NLS-1$
		boolean isChecked = false;

		// onclick script
		writer.write( "\n<script language=\"JavaScript\">\n" ); //$NON-NLS-1$
		writer.write( "function handleParam" + encParamId + "( e )\n" ); //$NON-NLS-1$ //$NON-NLS-2$
		writer.write( "{\n" ); //$NON-NLS-1$
		writer.write( "var obj;\n" ); //$NON-NLS-1$
		writer.write( "if( window.event )\n" ); //$NON-NLS-1$
		writer.write( "{\n" ); //$NON-NLS-1$
		writer.write( "  obj = window.event.srcElement;\n" ); //$NON-NLS-1$
		writer.write( "}\n" ); //$NON-NLS-1$
		writer.write( "else\n" ); //$NON-NLS-1$
		writer.write( "{\n" ); //$NON-NLS-1$		
		writer.write( "  if( e ) obj = e.target;\n" ); //$NON-NLS-1$
		writer.write( "}\n" ); //$NON-NLS-1$
		writer.write( "if( !obj ) return;\n" ); //$NON-NLS-1$

		writer.write( "var valCtl = document.getElementById(\"" + valueId //$NON-NLS-1$
				+ "\");\n" ); //$NON-NLS-1$
		writer.write( "var displayCtl = document.getElementById(\"" //$NON-NLS-1$
				+ displayTextId + "\");\n" ); //$NON-NLS-1$
		writer
				.write( "var nullCtl = document.getElementById(\"" + nullValueId + "\");\n" ); //$NON-NLS-1$//$NON-NLS-2$
		writer.write( "if( obj.id == \"" + radioNullValueId + "\")\n" ); //$NON-NLS-1$//$NON-NLS-2$
		writer.write( "{\n" ); //$NON-NLS-1$
		writer
				.write( "  if( nullCtl ) nullCtl.name=\"" + ParameterAccessor.PARAM_ISNULL //$NON-NLS-1$
						+ "\";\n" ); //$NON-NLS-1$
		writer.write( "  valCtl.name = '';\n" ); //$NON-NLS-1$
		writer.write( "  valCtl.value = '';\n" ); //$NON-NLS-1$
		writer.write( "  displayCtl.value = '';\n" ); //$NON-NLS-1$
		writer.write( "  displayCtl.name = '';\n" ); //$NON-NLS-1$
		writer.write( "}\n" ); //$NON-NLS-1$
		writer.write( "else\n" ); //$NON-NLS-1$
		writer.write( "{\n" ); //$NON-NLS-1$
		writer.write( "  if( nullCtl ) nullCtl.name='';\n" ); //$NON-NLS-1$
		writer.write( "  valCtl.name = \"" + encParamName + "\";\n" ); //$NON-NLS-1$//$NON-NLS-2$
		writer.write( "  valCtl.value = obj.value;\n" ); //$NON-NLS-1$
		writer
				.write( "  var labelCtl = document.getElementById( obj.id + \"_label\");\n" ); //$NON-NLS-1$
		writer.write( "  displayCtl.value = labelCtl.innerHTML;\n" ); //$NON-NLS-1$
		writer.write( "  displayCtl.name = \"" + displayTextName + "\";\n" ); //$NON-NLS-1$ //$NON-NLS-2$
		writer.write( "}\n" ); //$NON-NLS-1$

		writer.write( "}\n" ); //$NON-NLS-1$
		writer.write( "</script>\n" ); //$NON-NLS-1$

		String onClick = "handleParam" + encParamId + "( event )"; //$NON-NLS-1$ //$NON-NLS-2$

		int index = 0;
		for ( Iterator iter = selectionList.iterator( ); iter.hasNext( ); )
		{
			ParameterSelectionChoice selectionItem = (ParameterSelectionChoice) iter
					.next( );

			Object value = selectionItem.getValue( );
			try
			{
				// try convert value to parameter definition data type
				value = DataUtil.convert( value, paramDef.getDataType( ) );
			}
			catch ( Exception e )
			{
				value = null;
			}

			// Convert parameter value using standard format
			String displayValue = DataUtil.getDisplayValue( value, timeZone );
			if ( displayValue == null )
				continue;

			// If label is null or blank, then use the format parameter
			// value for display
			String label = selectionItem.getLabel( );
			if ( label == null || label.length( ) <= 0 )
				label = DataUtil.getDisplayValue( null,
						this.pattern, value, this.locale, timeZone );

			label = label != null ? ParameterAccessor.htmlEncode( label ) : ""; //$NON-NLS-1$
			String ctlId = encParamId + "_" //$NON-NLS-1$
					+ index;

			writer.write( "<input type=\"radio\" " ); //$NON-NLS-1$
			writer.write( " name=\"" + radioName + "\"" ); //$NON-NLS-1$//$NON-NLS-2$
			writer.write( " id=\"" + ctlId + "\"" ); //$NON-NLS-1$//$NON-NLS-2$
			__handleGeneralDefinition( );
			writer
					.write( " value=\"" + ParameterAccessor.htmlEncode( displayValue ) + "\"" ); //$NON-NLS-1$ //$NON-NLS-2$
			writer.write( " onclick=\"" + onClick + "\"" ); //$NON-NLS-1$ //$NON-NLS-2$
			if ( displayValue.equalsIgnoreCase( DataUtil.getDisplayValue( param
					.getValue( ), timeZone ) ) )
			{
				isChecked = true;
				writer.write( " checked" ); //$NON-NLS-1$
				if ( param.getDisplayText( ) == null )
				{
					this.displayTextString = label;
				}
				else
				{
					label = param.getDisplayText( );
				}
			}
			writer.write( " >" ); //$NON-NLS-1$
			writer.write( "<label id=\"" + ( ctlId + "_label" ) + "\"" ); //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$
			writer.write( " title=\"" + label + "\"" ); //$NON-NLS-1$ //$NON-NLS-2$
			writer.write( " for=\"" + ctlId + "\">" ); //$NON-NLS-1$//$NON-NLS-2$
			writer.write( label );
			writer.write( "</label>" ); //$NON-NLS-1$
			writer.write( "</input>\n" ); //$NON-NLS-1$

			index++;
		}

		// allow Null value
		if ( !paramDef.isRequired( ) )
		{
			boolean isNullValue = param.getValue( ) == null;

			// Null Value hidden object
			writer.write( "<input type=\"hidden\" value=\"" //$NON-NLS-1$
					+ encParamName + "\" id=\"" + nullValueId + "\"" ); //$NON-NLS-1$ //$NON-NLS-2$
			if ( isNullValue )
				writer.write( " name=\"" //$NON-NLS-1$
						+ ParameterAccessor.PARAM_ISNULL + "\"" ); //$NON-NLS-1$
			writer.write( " >\n" ); //$NON-NLS-1$

			writer
					.write( "<input type=\"radio\" id=\"" + radioNullValueId + "\" " ); //$NON-NLS-1$//$NON-NLS-2$
			writer.write( " name=\"" + radioName + "\"" ); //$NON-NLS-1$//$NON-NLS-2$
			writer.write( " onclick=\"" + onClick + "\"" ); //$NON-NLS-1$ //$NON-NLS-2$
			if ( isNullValue )
				writer.write( " checked " ); //$NON-NLS-1$
			writer.write( " >\n" ); //$NON-NLS-1$
			writer
					.write( "<label id=\"" + ( radioNullValueId + "_label" ) + "\"" ); //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$
			writer.write( " title=\"" + IBirtConstants.NULL_VALUE_DISPLAY + "\"" ); //$NON-NLS-1$ //$NON-NLS-2$
			writer.write( " for=\"" + radioNullValueId + "\">" ); //$NON-NLS-1$//$NON-NLS-2$
			writer.write( IBirtConstants.NULL_VALUE_DISPLAY );
			writer.write( "</label>" ); //$NON-NLS-1$
			writer.write( "</input>" ); //$NON-NLS-1$
		}

		// display text hidden object
		writer.write( "<input type=\"hidden\" " ); //$NON-NLS-1$
		writer.write( " id=\"" + displayTextId + "\" " ); //$NON-NLS-1$//$NON-NLS-2$
		if ( isChecked )
		{
			writer.write( " name=\"" + displayTextName + "\" " ); //$NON-NLS-1$ //$NON-NLS-2$
			writer
					.write( " value=\"" + ParameterAccessor.htmlEncode( this.displayTextString ) + "\" " ); //$NON-NLS-1$ //$NON-NLS-2$ 

		}
		writer.write( " >\n" ); //$NON-NLS-1$

		// parameter value hidden object
		writer.write( "<input type=\"hidden\" " ); //$NON-NLS-1$
		writer.write( " id=\"" + valueId + "\" " ); //$NON-NLS-1$//$NON-NLS-2$
		if ( isChecked )
		{
			writer.write( " name=\"" + encParamName + "\" " ); //$NON-NLS-1$ //$NON-NLS-2$
			writer
					.write( " value=\"" + ParameterAccessor.htmlEncode( this.valueString ) + "\" " ); //$NON-NLS-1$ //$NON-NLS-2$
		}
		writer.write( " >\n" ); //$NON-NLS-1$
	}

	/**
	 * Handle output Check Box type parameter
	 * 
	 * @throws Exception
	 */
	protected void __handleCheckBox( ) throws Exception
	{
		JspWriter writer = pageContext.getOut( );

		String encParamId = ParameterAccessor.htmlEncode( param.getId( ) );
		String encParamName = ParameterAccessor.htmlEncode( param.getName( ) );

		Boolean bl = (Boolean) param.getValue( );
		boolean value = bl != null ? bl.booleanValue( ) : false;

		// parameter hidden value control
		String valueId = encParamId + "_value"; //$NON-NLS-1$
		writer.write( "<input type=\"hidden\" " ); //$NON-NLS-1$
		writer.write( " id=\"" + valueId + "\" " ); //$NON-NLS-1$//$NON-NLS-2$
		writer.write( " name=\"" + encParamName + "\" " ); //$NON-NLS-1$ //$NON-NLS-2$
		writer
				.write( " value=\"" + ParameterAccessor.htmlEncode( this.valueString ) + "\" " ); //$NON-NLS-1$ //$NON-NLS-2$ 
		writer.write( " >\n" ); //$NON-NLS-1$

		String valCtl = "document.getElementById('" + valueId + "')"; //$NON-NLS-1$ //$NON-NLS-2$
		String inputCtl = "document.getElementById('" + encParamId + "')"; //$NON-NLS-1$ //$NON-NLS-2$
		String onClick = "var value = 'false';if( " + inputCtl + ".checked ) value='true';" + valCtl + ".value = value;"; //$NON-NLS-1$//$NON-NLS-2$ //$NON-NLS-3$

		writer.write( "<input type=\"checkbox\" " ); //$NON-NLS-1$
		if ( param.getId( ) != null )
			writer.write( " id=\"" + encParamId + "\"" ); //$NON-NLS-1$//$NON-NLS-2$
		__handleGeneralDefinition( );
		writer.write( " onclick=\"" + onClick + "\"" ); //$NON-NLS-1$ //$NON-NLS-2$
		if ( value )
			writer.write( " checked " ); //$NON-NLS-1$

		writer.write( " >" ); //$NON-NLS-1$
	}

	/**
	 * Handle Exception
	 * 
	 * @param e
	 * @throws JspException
	 */
	protected void __handleException( Exception e ) throws JspException
	{
		JspWriter writer = pageContext.getOut( );
		try
		{
			writer.write( "<font color='red'>" ); //$NON-NLS-1$
			writer.write( e.getMessage( ) );
			writer.write( "</font>" ); //$NON-NLS-1$
		}
		catch ( IOException err )
		{
			throw new JspException( err );
		}
	}

	/**
	 * @param id
	 *            the id to set
	 */
	public void setId( String id )
	{
		param.setId( id );
	}

	/**
	 * @param name
	 *            the name to set
	 */
	public void setName( String name )
	{
		param.setName( name );
	}

	/**
	 * @param pattern
	 *            the pattern to set
	 */
	public void setPattern( String pattern )
	{
		param.setPattern( pattern );
	}

	/**
	 * @param value
	 *            the value to set
	 */
	public void setValue( Object value )
	{
		param.setValue( value );
	}

	/**
	 * @param displayText
	 *            the displayText to set
	 */
	public void setDisplayText( String displayText )
	{
		param.setDisplayText( displayText );
	}

	/**
	 * @param isLocale
	 *            the isLocale to set
	 */
	public void setIsLocale( String isLocale )
	{
		param.setIsLocale( isLocale );
	}

	/**
	 * @param title
	 *            the title to set
	 */
	public void setTitle( String title )
	{
		param.setTitle( title );
	}

	/**
	 * @param cssClass
	 *            the cssClass to set
	 */
	public void setCssClass( String cssClass )
	{
		param.setCssClass( cssClass );
	}

	/**
	 * @param style
	 *            the style to set
	 */
	public void setStyle( String style )
	{
		param.setStyle( style );
	}
}
